"The rapids are like arrows, and the waves are like galloping." which sentence in the Three Gorges is similar to his?

"The rapids are like arrows, and the waves are like galloping." which sentence in the Three Gorges is similar to his?

Although ride to run against the wind, not to disease

If the maximum value of F (x) = cosx + SiNx + A & # 178; (x + π / 4) is the root sign 2 + 3, try to determine the value of constant a
As asked by the title [PS: garbled code may appear]

A = ± root sign 3. First expand sin (x + π / 4) and then merge it to get f (x) = (1 + A & # 178; root sign 2 / 2) (SiNx + cosx). This problem is actually to find the maximum value of SiNx + cosx. Because (SiNx + cosx) &# 178; = 1 + cos2x, that is, the maximum value of SiNx + cosx is root sign 2

How many boys are there in a class
Teaching arithmetic

The number of students in the class is X
5/9x﹣4=x﹣(2/5x﹢6)
5/9x﹣4=x﹣2/5x﹣6
5/9x﹣4=3/5x﹣6
3/5x﹣5/9x=6﹣4
27/45x﹣25/45x=2
2/45x=2
x=2÷2/45
x=2×45/2
x=45
The number of male students is 5 / 9 × 45-4 = 25-4 = 21

A simple way to calculate (8 / 9 plus 3 / 4 minus 2 / 3) times 72 is equal to how much?

It is known that {an} is an equal ratio sequence, A1 = 1, A5 = 256, Sn is the sum of the first n terms of {BN}, B1 = 2, 5s5 = 2s8, let TN = A1B1 + a2b2 +... + anbn, find TN

It is the first step to find the general term formula: A5 / A1 = q ^ 4 = 256, q = 4, an = A1 * q ^ (n-1) = 4 ^ (n-1) n ∈ n *; 5s5 = 2s8 deduce: 5 (B1 + B5) * 5 = 2 (B1 + B8) * 825b1 + 25b5 = 16b1 + 16b89b1 = 16b8-25b5, get tolerance 12D = 18b1, d = 3bn = 3n-1, n ∈ n * an * BN = (3n-1) * 4 ^ (n-1) n ∈

Seven out of eight parts of a barrel of oil is used up, and there are 15 liters left. How many liters did this barrel of oil have

15÷1/8=120

Find the rule and fill in 16,5,15,4,14,8,13,11, (), ()

The back two combs are 12 18
The first, third, fifth and seventh digits of this column are 16, 15, 14 and 13 respectively. If each digit is decremented by 1, we can deduce that the ninth digit is 12
The second, fourth, sixth, and eighth digit is 5, 4, 8, and 11. The last digit is the sum of the first two digits minus 1. The tenth digit is 17

The prime number has the least number of factors in the natural number______ (judge right or wrong)

From the analysis, we can see that the prime number has the least number of factors in the natural number, which is wrong. For example, 1 has only one factor, so the answer is ×

The detailed process of finding the maximum value of F (x) = x ^ 2-2x-3 on [- 3,2]

Axis of symmetry x = 1, opening upward
So the minimum value on [- 3,2] is f (1) = - 4
Because the distance between - 3 and 1 is greater than the distance between 2 and 1
So the maximum is f (- 3) = 12

1. Xiao Ming has 60 more stamps than Xiao Lin. later, Xiao Ming bought 12 more. At this time, Xiao Lin has 25% fewer stamps than Xiao Ming. How many stamps does Xiao Lin have?
2. For a batch of coal, 2 / 3 of the total coal will be burned in January, and the remaining 2 / 5 tons will be burned in February. At this time, there are still 8 tons of coal left. How many tons of the original coal?

How many stamps does Xiao Lin have? Suppose: Xiao Lin x Zhang Xiao Ming (x + 60) x = (x + 60 + 12) (1-25%) x = 0.75 (x + 72) x = 0.75x + 540.25x = 54 x = 216 so Xiao Lin has 216 stamps